The head area is in so far critical since aggressive balls simply need the oil in the front part of the lane to make it though the mid lane area and the back end "alive" - in most cases, balls with matte finishes, rolly drillings or particle pieces need head oil to work properly. These are intended to work early, even though some modern coverstock formulations allow matte balls some good length and good response in the drier back parts of the lane.
A ball that goes "clean through the heads" is normally a piece that glides well in the (head) oil, to save energy for the back end (in most cases polished balls), but, as mentioned before, some pieces also have this "ability" due to their design.
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DizzyFugu - Reporting from Germany
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